Combined type-writing and computing machine.



No.-654,992. Patented July 3|, 1900-...

' H. MARSHALL:

COMBINED TYPE WRiTING AND COMPUTING MACHINE.

(Application filed Apr. 14:, 1898.)

(No Model.) 3 Sheets Sheet I.

l v enZoA J/vMU WWM flaw No. 654,992. Patented luly 3|, 1900.

H. MARSHALL.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

(Application filed Apr. 14, 189 8.) (No Model.) 3 Sheets-Sheet 2.

flit" 666697 iflXM v g'g T rm: mums PETERS c'u, PNOT0 LYTHO-,WASHINGTON, n. c.

No. 654,992. Patented July 31, I900. H. MARSHALL.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

(Application filed Apr. 14, 1898.) (No Model.)

3 Sheets-Sheet 3.

f fnverztoii 950N471 WG 'UNrrEn STATES HOLMES MAnsHAEL, or CLEVELAND,or-no, Assren on TO THE NATIonAiJ' ADDOGRAPl-I COMPANY, on JERSEY CITY,NEW JERSEY.

COMBINED TYPEHWRITING AND cot/redrawn MACHINE.

SPECIFIGA'IZON forming part of Letters Patent No. 654,992, dated July31, ieoog Application filed April 14, 18 98. Qerial No. 67%,586. (Nbmodeli) To ctZZ whom, it may concern:

Be it known that I, HoLMEs MARsHALL, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in a Combined Type-Writingand Computing Machine, of which the following is a full, clear, andexact description, reference being had to the accompanying draw- IOings. v

My invention isan improvement on the combined type writer and computingmachine shown in my prior patent, No. 575,570, granted to me January 19,1897. In the construction there shown a computing-machine is placedbelow a type-writing machine and there is an interposed plunger-carriagewhich (when the numerals are used) moves with the typewriter carriageover the computing-machine keys and the different pluugers of which arecaused to strike upon the different computer-keys according to thenumeral-key which is depressed on the type-writer. The movement of theplunger-carriage with the type-writer carriage has the disadvantage thatno marks other than numerals requiring a movement of the type-writercarriage for their proper spacing-e. g., the comma separating thousandsand the period dividing cents from dol- 0 larscan be interspersed amongthe numerals without shifting the plunger-carriage to the wrongcomputing-keys. A

One of the objects of the present invention is to overcome theabove-mentioned difficulty and render the lateral movement of thecomputer-operating mechanism independent of the movement of thetype-writer carriage. This is accomplished by providing for thatmechanism its own escapement and operating the same by nu meral-keys ofthat type-writer.

Another object is to simplify and cheapen the construction and do awaywith much of the intermediate mechanism heretofore re quired between thetype-writer and the coinputing-wheels. v

Other objects are to render the machine more convenient for the operatorand more certain in its action.

The invention may be best described as consisting in the combinations ofparts here inafter specified; as definitely en umerated in the claims. Iwish to be understood, however, as claiming the combinations set out inthe claims for any and all purposes and without limitation to thespecific form in which I have shown the invention.

The drawings clearly disclose the invert tion.

Figure 1 is asectional side elevation of the same. Fig. 2 is a plan ofthe computing mechanism and the operating levers, being a section on theline 2 2 of Fig. 1. Fig. 3 is a vertical section on the line 3 3 of Fig.1, showing the computer-carriage. Fig. a is a plan of the keyboard ofthe type-writer. Fig. 5 is a plan, and Fig. 6 a side elevation, of thees capemen t-bars for the com puter-carriage, the movable bar beingshown in the position it normally has when in use, as in Fig. 2, whenthe. tension of the spring shown is overcome by a stronger spring. Fig.7 is a perspective view of the safety device for insuring full movementof the computer-lever when the type-writer numeral-key is depressed.Figs. 8 and 9 show the computing-wheels,the former being a verticalsection on the line 8 8 of Fig. 2 or Fig. 9 looking in the direction ofthe arrow and the latter being a View at right angles to the planeconnecting the axes of the wheels shown in Fig. S 't'. 6., looking inthe direction of the arrow marked 9 in Fig. 1. These two views show themanner in which the tens are carried from one column to the next on thecomputer-Wheels. Fig. 10 is a detail view in plan of an indicatingmechanism for temporarily stopping the type-writer carriage at a properpoint during its travel. This mechanism is shown in side elevation atthe top of Fig. 1.

I will first describe very briefly the typewriter mechanism shown andthen the computing-wheels and their immediate operation and then, withconsiderable fullness, the connecting mechanism between the two.

A represents the frame of the machine; B, a usual type-writer carriagetraveling on the top thereof and having the platen b and pivotedrack-bar I); Q, the inking-ribbon; O, the operating-levers, which areconnected by suitable intermediate mechanism, so that their depressionscause the type-bars D to be swung up into operative positions. Thedepressions of the levers C also cause, through the intervention of asuitable lever E and link 6, the operation of the escapement forallowing movement of the type-writer carriage. F represents the ordinaryfinger-keys for the letters and punctuation-marks of the machine,andfthe usual space-bar for causing the movement of the carriage alone.It is to be understood, of course,that this much of the mechanism may beof any approved construction.

The computing mechanism proper consists of a series of loosely-journaledwheels carrying on their periphery digits in order combined with propermechanism, whereby any wheel may be rotated independently of the wheelsat its right; but when it has rotated one space in excess of thecomplete gamut of its digits the wheel next to the left is caused tomove the distance of one digit, thus effecting the carrying of one tothe next left wheel every time ten is added to a wheel. Thecomputing-wheels are referred to herein generically by G. Eight of themare shown and designated, specifically, by G to G They are looselyjournaled in the shaft g.

The connecting mechanism between the computing wheels consists of aseries of wheels H to H (designated, generically, by 11,) looselyjournaled on a suitable shaft 7b and having gear-teeth which mesh withsimilar teeth on the wheels G and each having a pawl h, which is adaptedat every revolution of the wheel H to impinge against a pin g,projecting from the side of the next left wheel G, and thereby move suchwheel the distance of one digit. Spring-pressed dogs J engage with thewheels G and prevent their backward movement, while a light spring 7L2,acting on the pawl 7t, allows each wheel G to be rotated forwardindependently of the pawl, but returns the pawl to place each time a ping moves past it. The friction of the wheels on their shafts and of thedogs J against the wheels G prevent any wheel G when turned whileengaging the pawl 71, from thereby turning the wheel 11 and the wheel Gat the right, the spring 7L2 always yielding to allow the pins g to moveidly past the pawl.

There may be one or more complete gamuts of digits on thecomputing-wheels G, as desired; but the connection between these wheels,by means of the gears II, must be such that when any wheel moves throughone more than the complete gamut the wheel next to the left will movethe distance of one digit. In the form shown in the drawings there aretwo complete gamuts of digits on each computer-wheel, and there aretwenty gear-teeth on these wheels and twenty pins g, each gear-tooth andpin corresponding, therefore, to one digit. There are ten gearteeth onthe wheel H.

As an illustration of the operation of the wheels, suppose the wheel Gis moved a distance from 0 to 6. None of the other wheels are therebyaffected; but if it is moved an additional distance of 6 it will havecompleted its half-rotation when this movement is four-sixths of the waythrough, and this will have caused a complete rotation of the wheel H,which will drive the wheel G the distance of one digit, While the othertwosixths of the movement will move the wheel G to the position 2,wherefore figure 1 will be read on the wheel G and figure 2 on the wheelG thus giving the result of 12. Suitable windows K over the wheels Gfurnish means for reading the proper numerals.

This much of the construction is old and may be of any approved form,and is thus fully described that it may be clearly under stood.

I will now take up the description in detail of the mechanism by whichthe depression of a numeral-key on a type-writer keyboard causes thecorresponding rotation of the wheels G.

A suitable frame M, preferably of a sort of channel shape, constituteswhat I call the computer-carriage and is slidably journaled on a pair ofparallel transverse rods N, suitably supported by the frame of themachine, bosscs m on the sides of the frame furnishing suitable bearingsaround the rods and allowing the rest of the frame to be made quitelight. Piveted between a pair of ears on at the rear of the carriage isa lever O. This lever passes loosely through a suitable guiding-yoke m"at the forward end of the carriage and has its forward end curved in theare of a circle about its pivot and gearteeth 0', formed thereon. hoseteeth are adapted to mesh with the teeth of the wheels G when the leveris depressed. A suitable spring 0* tends to raise the lever 0 until itis stopped by hitting against the top plate of the yoke m There are atleast as many teeth 0 on the lever as there are teeth on such portion ofthe wheel G as corresponds to nine digits, and hence if a lever isdepressed its full distance the wheel G will be rotated to add nine,whereas if the lever is depressed only a portion of its distance thewheel G will be rotated through a corresponding portion of suchmovement. By depressing the lever, for example, one-ninth of the waydown after it has engaged the wheel G that wheel is rotated one digit.

Extending across the frame from front to back at each side is a bar R,having on its in ner edge a series of bearing-faces 0', arranged inechelon, and there are pivoted to these faces a series of bails S to S".Each bail consists of a transverse tube 5, having projecting from itsends the bars .9, at the rear ends of which the pivots are secured. Thepivoting of the bails in the manner described allows them to be nestedone within the other from the rear to the front of the machine, asshown.

ceases If a bail (generically designated S) is depressed sufficiently toimpinge against the lever O and force it downward into engagement withthe wheel G in front of the lever, that wheel will be rotated a distancedepending upon the distance of the bail from the fulcrum of the lever O.For example, if the rear bail S is depressed its full stroke the lever Ois forced downward sufficiently to rotate the wheel G from O to 9, whileif the bail S is depressed its stroke the wheel G is rotated only thedistance of one digit.

The fin ger-keys which represent the numerals are placed in the centerof the keyboard, as shown, and are slightly elevated, which I find to bea very convenient arrangement. Each of these keys has a stem V, (the specific stems having exponents corresponding to the numeral on the keys,)which forks over one of the operating-levers O for the operation of thetype-bar in the usual manner, but

instead of ending at the guide-plate a, carried by the frame, as therest of the keys do, extends downward and may act directly upon a bail,as shown in the case of the stem V or it may operate the bails throughintermediate mechanism. Such mechanism consists, preferably, of a fiatlever U, (so. a series U to U*,) pivoted to the frame at its front endat 'u, and projecting through a slot at the lower. end of the stem andthrough a slot in a rod T, which extends upward from the bail. Thismechanism furnishes convenient means, whereby the stem may act upon abail, which is a distance back of it.

It is to be noticed that the rods T are screwthreaded into the bails andhence are ad justable, and therefore the bail may be made to stand atjust such height above the lever O that when the numeral-keycorresponding to that bail is depressed its full distance the bail willdepress the lever 0 just the distance required to turn the wheel G thenumber of digit-places of that numeral-key.

The depression of each nu meraL-key, inaddition to operating the leverO, actuates the escapement of the computer-carriage, causing it to moveone space to the right. I will now describe this escapement.

A pair of bars W W extend across the machine one above the other, asshown. These bars have on their front edges notches w, the distancebetween which is equal to the dis tance between two consecutive wheelsG. The lower bar W is stationary, while the upper bar,bein g secured byscrews w,passingloosely through slots w in said bar, is capable of amovement limited by the length of that slot, and this movement is equalto the distance between two consecutive notches. A spring 10 tends todraw the upper bar to its extreme left position.

Pivoted between the lugs m of the com puter-carriage below the lever Ois a lever I,

from the underside of which depends a lug t in front of the notchedbars, and to this lug is pivoted a dogt", having a V-shaped nose,

which is adapted to take in the notches of the bars. A spring "L tendsto raise this lever, and a strap m passing around the same on the sideof the yoke m limits the movement of the lever and guides it. The spring7? keeping the lever I normally elevated also keeps the dog 2" normallyout of the lower notched bar and in engagement with the upper bar W, anda'strap y, leading from the drum Y, (which incloses a spiral springtending to rotate the drum in the direction of the arrow shown thereonand being stronger than the spring 20 draws the carriage, and with itthe upper bar W, to the extreme right-hand position of that upper bar.The lever I being depressed a short distance, the dog 2" will pass outof the notch in the upper bar and into the notch in the lower bar. Thelower bar will prevent the strap 3/ from moving the carriage, while thespring 10 will draw the upper bar to the left. When the dog again rises,it passes into a notch in the upper bar, which is next to the notchoccupied previously, and as the dog leaves the lower bar the pull on thestrap y will move the carriage one space to the right. It thus resultsthat upon the return to its normal position of the lover I after adepression the computer-carriage is moved one space to the right.

Projecting from the upper side of the lever I are a series of adjust-able screw-pins 75 of which there are as many as there are bails S.One of these pins stands under each bail and is so adjusted that thebail will not strike it until almost at the lower limit of its movement,when it will strike the pin and depress the lever I enough to operatethe escapement. If the finger-key marked 0 is forced downward its fullmovement, the lever O is not depressed sufficiently to engage. with thewheel G; but the lever I is moved downward and causes the escapement ofthe carriage as the bail begins to rise. When the numeral 1 isdepressed, the bail S depresses the lever O sufficiently to cause itsengagement with the wheel G and rotate it one tooth. This depression ofthe bail also depresses the lever I. As the bail reaches the lowest endof its movement and begins to return, the lever O is prevented fromreturning by the engagement of its teeth with the wheel G, which cannotrotate backward on account of the dog J; but as the bail rises the leverI rises and the dog 1 passes back into the notch of the bar W, and theescapement of the computer-carriage is actuated. Thereupon the strap 1/draws the computer-carriage to the right, drawing the teeth of the leverO horizontally out of the teeth of the wheel G. After the lever O hascleared the wheel G this lever rises, bymeans of its spring 0 and passesabove the next wheel G into position to engage with it, coming to restthere as the escapement is completed.

A series of plates P, projecting upward, as

ICC

shown, just at the left of the rear portion of each wheel G, preventsthe teeth of the lever from passing into engagement with the next wheelat the right, when the escapement is caused, if the tension on thespiral spring with the drum Y should be such as to operate the carriagemore quickly than the spring 0 causes the rise of the lever 0.

At the side of the numeral-keys on the keyboard I place a key f, whichhas a stem operating upon the bail S and thus causing the *escapement ofthe comp Liter-carriage the same as the zero key, and this key has acorresponding lever O, which operates the escapement mechanism of thetype-writer carriage, as usual, but has no type-bar, wherefore itresults that when this keyis depressed the escapement of the type-writercarriage and the eomputencarriage is simultaneously effected and the twomove in unison without either the type-writer printing or the computeradding. The ordinary space bar f causes the escapement of thetype-writer carriage alone.

Some suitable stop, as the post a projecting upward from the base, isprovided for the computer-carriage when it comes into the posit-ion atthe right of the last computer-wheel, and additional notches in the barsXV W are provided for the up-and-down movement of the dog t. The lowernotch 20 maybe made somewhat wider than the notches '10, so that anaccurate position of the stop need not be required, while the uppernotch may be wide enough so that the bar WV can travel its full movementwithout engaging the dog, as shown at w in the drawings. If it is notdesired to use the computer, all that is necessary is to let thecomputer-carriage pass to the extreme right, where its levers will beoperated idly.

I have shown a bar in projecting from the computer carriage, whichfurnishes conveni ent means for the returning of that carriage to theleft-hand computer-wheel. As it is returned the dog 11 simply springspast the notches in the upper escapement-bar, the spring 2' acting onthat dog, always returning it to its normal place.

As the amount of rotation of awheel G depends upon the amount ofdepression of the leverO it is essential that means be provided wherebyif a numeral-key is depressed at all it must be depressed its fullstroke. The safety device which I employ to attain this result is shownin Figs. 1 and 2 in place in the machine and in Fig. 7 in detail. Itconsists of a suitably-shaped ratchet-pawl Z carried by each bail and astationary ratchetblock Z, of the approXimately-elliptical shape shown,carried by the plate a of the frame. As the bail is depressed about itspivot the pawl moves forward and downward, and thus the lip .e' at itsupper end comes into contact with the ratchet-teeth on the back face ofthe block Z. If before the bail reaches its lowest limit the downwardpressure on the numeral-key is stopped, the ratchet-paw1 holds the baildepressed and the key will not rise nor the computer-carriage move. Asthe bail reaches its lowest position the pawl passes beneath the blockand the spring 2 acting thereon causes its upper end to swing over ontothe front face of the ratchet-block. As the bail rises, therefore, thepawl-1i travels upward on the front face of the block, where theratchet-teeth are in the reverse direction, and these teeth prevent thedepression of the bail before it has reached its highest position. Whenit has reached this position, the pawl springs back into the normalposition shown in Fig. 7. It therefore follows that after a key has beenonce depressed a material distance it must be depressed its fulldistance and brought back to its normal position.

In writing a series of numbers which are to be added it is of courseessential that they be directly beneath each other in the propercolumns. In order that the type-writer carriage may be quickly andaccurately brought to the same point at each line for the beginning ofthe column, I provide on some independently-movable part of thecarriage, as the rack-bar 6 a suitable pin Z), and on some stationarypart of the machine a suitable bar L, which has an overhanging portionI, which projects over the normal path of the said pin and is freetherefrom, but has at its end a depending lip Z, which is adapted tostand in the path of that pin when the rack-bar is tipped. The usuallever Z9 is provided fortipping the rack-bar. lVhen that bar is tipped,the carriage becomes released from the es capement-dogs and is shiftedto the left until the pin b impinges against the lip Z. Thereupon thepressure is taken off of lever Z) and the rack-bar returns to its normalposition, the dog engaging with the teeth and the carriage standing insuch position that there are the desired number of spaces at the end ofthe line. In the form shown in the drawings, Fig. 10, there is justspace enough left after the pin Z1 is brought against the lip Z for theWriting of eleven characters. This provides for the eight numerals whichthe computer is designed to take, a period, a comma, and adollar-sign-e. g., $100,000.00.

In the operation of my machine the typewriter, with exception of thenumerals, is operated exactly as if there were no computing mechanismpresent. If it is not desired to use the adding mechanism, thecomputingcarriage may be allowed to move to the extreme right out of thepath of any of the wheels G and the numerals used in the ordinarymanner. When it is desired to add numbers which are to be written by thetype writer, the computer-carriage is shifted to the left and the wheelsare each brought to zero by striking on the keyboard successively thosefigures which added to the figures read on the wheels through thewindows K will in each case produce 9 until the last wheel is reached,when enough is added to make 10. Thus if the number which is readthrough thewindows of the computer is 237,368.42

the keys should be depressed to produce the number 762,631. 58, whichwill leave all the computer-wheels at Zero. The computer-carriage isthen shifted .to the left and the computer is ready to add.

Of course any desired explanation may be 'written by the type-writerbefore the num bers to be added. If the name of the account, forinstance, is written on the machine and then the type-writer carriageshifted to the left until the pin b impinges against the bar L, thisleaves the type-writer carriage in a position corresponding to thatoccupied by the computer-carriage, and when the numerals are now struckboth carriages move in unison. If it is desired to put in commas orperiods to separate the dollars from cents,

this can be done without affecting the computer, as it only moves whenthe numerals are depressed. After the number is written thecomputer=carriage is returned to its lefthand position and the processrepeated. After all the numbers have been written their sum is read fromthe computer through the windows K and may be written at the bottom ofthe column.

Having described my invention, I claim 1. A computing mechanism having aplurality of gear-wheels adapted in their rotation to move numeralcharacters to compute, a shiftable geared member adapted to engage withdifferent gear-wheels and rotate them, and means for shifting saidmember whereby it may operate successively on different wheels, combinedwith a type-writer having numeral-keys, and intermediate mechanismbetween such numeral-keys and such shiftable member whereby the keys mayactuate the member different amounts and thereby rotate the computingwheels an amount corresponding to the numeral of the key, substantiallyas described.

2. In combination, a plurality of computing-wheels, loosely journaledside by side, a pivoted lever having a segmental rack on an are aboutits pivot, said rack being adapted to engage with said wheels, means forchanging the relative position of the lever and computing-wheels wherebythe lever may engage with different wheels, and mechanism for actuatingsaid lever the'desired amount, substantially as described.

3. In combination, a plurality of computing-wheels, loosely journaledside by side, a pivoted lever having a segmental rack on an are aboutits pivot, said rack being adapted to engage with said wheels, means formoving the lever out of engagement with a computing-wheelirrespectiveof-the amount of rotation thereof, means for preventing the lever whenthus released from passing into engagement with the next wheel until ithas returned to an initial position, and mechanism for actuating saidlever the desired amount, substantially as described.

4. The combination of atype-writing mechanism, and a computingmechanism, two distinct escapement mechanisms for the same, andfinger-keys some of which operate both escapement mechanisms and someonly one, substantially as described. 7

5. A type-Writer mechanism having two classes of depressible keys,namely, numeralkeys and letter or punctuation keys, and a shiftingpaper-carriage and an escapement therefor which is adapted to beactuated by the depression of either class of keys, in combination witha series of computing-wheels, a shiftable intermediate mechanism betweenthe computing-wheels and the numeral-keys of the keyboard whereby theactuation of the numeral-keys may cause the operation of thecomputing-wheels,an escapement mechanism for said shifting intermediatemechanism and means for actuating this escapement mechanism by theactuation of the numeral-keys but not'by the other class of keys wherebycharacters other than numerals may be in terspersed among the numeralswritten by the type-writer mechanism without shifting the intermediatemechanism to the computing-wheels, substantially as described.

6. The combination of a series of computing-wheels, a pivoted leveradapted to actuate the same, a series of type-writer keys adapted tostrike numerals on a type-writer and to also operate said pivoted lever,an escapement mechanism for the pivoted lever distinct from theescapement of a type-writer carriage, and means for actuating'saidescapement by the depression of the numeralkeys, substantially asdescribed.

7. The combination of a series of computing-wheels, a pivoted lover, aseries of bails located above the same, a series of type-writer keysadapted to strike numerals on a type writer and to depress these bailsagainst the lever, means for communicating the movement of said lever tosaid computing-wheels, and an escapement actuated by the bails forshifting the lever laterally, and another escapement governing theprinting of the typewriter, substantially as described.

8. A type-writing machine havingapapercarriage, type, and finger keysconnected with the type to print on paper on the carriage, and anescapement for the type-writer carriage, combined with a computingmechanism, a computer-carriage carrying means adapted to govern thecomputing mechanism and shiftable with reference thereto, an escapementfor the computer-carriage distinct from that for the type-writercarriage, and connections betweeuthe finger-keys and the governing meansof the computer-carriage, substantially as described.

9. In a combined typeavritin g and eomput ing machine, a plurality ofcomputing members, a 'computer-carriage, means carried thereby andadapted to govern the computing members, an escapement mechanism forsaid carriage adapted to move it laterally, part of said escapementbeing carried by said carriage, a keyboard containing numeralkeys, andsuitable connections from said keys to said governing means and saidescapement carried by the carriage, whereby said keys may operate saidcomputing members and cause the escapement of said computer-carriage,combined with a carriage for the paper to be printed and an escapementfor said paper-carriage, suitable type, and a connection between thetype and said keys whereby the keys may actuate the printing of thepaper on said paper-carriage, substantially as described.

10. In a combined type-writing and computing machine, a plurality ofcomputingwheels, a computer-carriage, a lever carried thereby andadapted in its movement to actuate the wheels, an escapement mechanismfor said carriage adapted to move it laterally, a second lever carriedby said carriage and adapted to actuate the escapement mechanism, akeyboard containing numeral keys and suitable connections between saidkeys and the first-mentioned lever, and between said keys and theescapement-lever whereby said keys may operate said computing-wheel andcause the eseapement of said computer carriage, combined with a secondcarriage, for the paper to be printed, type adapted to cooperatetherewith, and a connection be tween the type and the said keys wherebythe keys may actuate the printing of the paper, substantially asdescribed.

11. In a computing mechanism, the combination of a plurality ofcomputing-wheels, a movable carriage, an operating-lever pivotedthereto, said lever being adapted to actuate said computing-wheels, aspring tending to draw said carriage in one direction, anescapement-lever pivoted to said carriage, a dog carried by said leverand constituting a portion of a suitable escapement mechanism, saidescapement mechanism normally operating to retain the carriage againstthe pull of said spring but allowing said spring to pull the carriage acertain definite distance after the escapement has been actuated,substantially as described,

12. The combination of aseries of computing-wheels arranged side byside, a shiftable lever adapted to operate the same, the amount ofrotation of said wheels depending upon the amount of depression of saidlever, fingerkeys adapted to depress said lever different amounts, andan escapement adapted to cause said lever to shift laterally withreference to said computing-wheels, and means whereby said escapementmaybe actuated by a fingerkey when said lever is depressed the fullamount said key is adapted to give it,whercby a computer-wheel mayremain undisturbed.

when the lever shifts from it, substantially as described,

13. The combination with the key-levers and typebars of a type-writingmachine, of a set of numeral-keys the stems of which not only engagewith said key-levers but continue below the same while rigid with theupper part of the stem, a set of bails, said stems operating to actuatesaid bails, whereby depressions of the numeral-keys depress the usualkey-levers and also the bails, combined with a computing mechanismoperated by the depression of said bails, substantially as described.

14. The combination of a computing mechanism, a depressible lever foractuating the same, and adapted to actuate the same to a definite amountaccording to the depression of the lever, a type-writermechanism,intermediate mechanism between the type-writer and leverwhereby the depression of the key causes the actuation of said lever,and a safety device operating to prevent the return of said key to itsnormal position after it'has been depressed a material amount until ithas been depressed its full stroke, whereby alevcris always depressed adefinite amount by the de= pression of a given key, substantially asdescribed.

15. In a combined type-writer and computing mechanism, the combinationof a leverfor operating the computer, a series of bailsstanding acrossthe lever and adapted to be depressed onto it and cause its depression,a stationary block having ratchet-teeth, apawl carried by the bail andadapted to engage with said ratchet-teeth and prevent the return of thebails after such engagement has once begun until the pawl has descendedclear of the block, and a key adapted to cause the depression of saidbail, substantially as described.

16. The combination, in a type-writing and computing machine, of atype-Writer mechanism having a movable paper-carriage and a computingmechanism adapted to add a column of figures of less width than thewidth of the line which maybe written by the typewriting machine, and astop for bringing the carriage to a standstill at a proper point at theleft of. the numerals to be added, said stop being normally inoperative,but being thrown into operation when the escapement mechanism of thecarriage is thrown out of gear and the carriage loosely shifted,substantially as described.

17. The combination with a ty 2e -writer mechanism havingatravelingcarriage forit-s paper and a movable rack-bar on that car riage whichmay be moved to allow the free shifting of the carriage, of a pinsecured to said rack-bar, and a stationary bar normally out of the pathof said pin but adapted to stand in its path when the rack-bar is movedto allow free shifting of the carriage, whereby the carriage may beshifted by means of releasing its rack-bar and brought to a stop at aproper point by its pin engaging said bar, stantially as described.

said engagement being broken when the rack- In testimony whereof Ihereunto affix my bar is returned to its normal position, subsignaturein the presence of two Witnesses. stantialiy as described.

18. The combination of a type Writing 7 HOLMES MARSHALL mechanism andacomputing mechanism, two WVitnesseszdistinctescapement mechanismsforthesame, ALBERT I-I. BATES,

but does not operate to print or compute, sub 10 and a key whichoperates both escapements I E. B. GILCHRIST.

